.uan-g{
	float: left;
	margin-left: 40px;
	color: #fff;
	font-size: 18px;
	border: 1px solid #00b38a;
	background-color: #00b38a;
}
.nan-g{
	float: right;
	margin-right: 40px;
	color: #00b38a;
	font-size: 18px;
	border: 1px solid #00b38a;
	background-color: ghostwhite;
}
.san-g{
	float: right;
	margin-top: 10px;
	margin-right: 40px;
	color: #00b38a;
	font-size: 18px;
	border: 1px solid #00b38a;
	background-color: ghostwhite;
}
<a href="#"><input class="san-g" type="submit" value="查看更多话题" style="width: 260px; height: 50px;" /></a>